1. Politecnico di Torino,Department of Applied Science and Technology,Turin,Italy
2. Politecnico di Torino,Department of Electronics and Telecommunication,Turin,Italy
3. Università degli Studi di Torino,Department of Surgical Science,Turin,Italy
4. Università degli Studi di Napoli,Dep. of Electrical Engineering and Information Technology,Federico II,Naples,Italy
5. Politecnico di Torino,Dep. of Applied Science and Technology,Turin,Italy